Adrian Beltre led all MLB hitters with 49, which was also good for the 9th-best season in team history.

The Red Sox record is also the MLB record: 67, by Earl Webb, at age 33, in 1931. Webb hit 20 more doubles than any other player that year. It's one of the least-known "unbreakable" records; no one has hit as many as 60 doubles in 74 years. (Here is the SABR bio for the Earl of Doublin'.)

The Red Sox record is also the MLB record: 67, by Earl Webb, at age 33, in 1931.

I somewhat remember Webb being a baseball oddity, so I also looked at his B-Ref page.

He hit 30 doubles the year before and 28 the following season, splitting his time between Boston and Detroit. In his seven-year career, he hit 155 doubles, so he collected 43% of his career total in one season... and set the record doing it!

Oh, and why he was traded the following season, according to the Bullpen, was to get Dale Alexander who, like Webb, was a doubles hitter with a short career.

Fenway Park existed then, but there was no "Green Monster" yet off which to hit doubles."

It was not green, but hasn't FP always had a big-ass wall in left? The third picture down on this post is from 1917-1918. The 4th one is from 1912. Maybe it was not quite 37 feet high -- though it might have been -- but there was a high wall there that was not in CF or RF.